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authorHeiko Carstens <heiko.carstens@de.ibm.com>2015-02-12 13:08:27 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-03-25 11:49:33 +0100
commit5a79859ae0f35d25c67a03e82bf0c80592f16a39 (patch)
tree37264d49f069812f19ced94e6ae171814fb7e498 /arch/s390/kernel/relocate_kernel.S
parent1833c9f647e9bda1cd24653ff8f9c207b5f5b911 (diff)
s390: remove 31 bit support
Remove the 31 bit support in order to reduce maintenance cost and effectively remove dead code. Since a couple of years there is no distribution left that comes with a 31 bit kernel. The 31 bit kernel also has been broken since more than a year before anybody noticed. In addition I added a removal warning to the kernel shown at ipl for 5 minutes: a960062e5826 ("s390: add 31 bit warning message") which let everybody know about the plan to remove 31 bit code. We didn't get any response. Given that the last 31 bit only machine was introduced in 1999 let's remove the code. Anybody with 31 bit user space code can still use the compat mode. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/relocate_kernel.S')
-rw-r--r--arch/s390/kernel/relocate_kernel.S118
1 files changed, 0 insertions, 118 deletions
diff --git a/arch/s390/kernel/relocate_kernel.S b/arch/s390/kernel/relocate_kernel.S
deleted file mode 100644
index f4e6f20e117a..000000000000
--- a/arch/s390/kernel/relocate_kernel.S
+++ /dev/null
@@ -1,118 +0,0 @@
-/*
- * Copyright IBM Corp. 2005
- *
- * Author(s): Rolf Adelsberger,
- * Heiko Carstens <heiko.carstens@de.ibm.com>
- *
- */
-
-#include <linux/linkage.h>
-#include <asm/sigp.h>
-
-/*
- * moves the new kernel to its destination...
- * %r2 = pointer to first kimage_entry_t
- * %r3 = start address - where to jump to after the job is done...
- *
- * %r5 will be used as temp. storage
- * %r6 holds the destination address
- * %r7 = PAGE_SIZE
- * %r8 holds the source address
- * %r9 = PAGE_SIZE
- * %r10 is a page mask
- */
-
- .text
-ENTRY(relocate_kernel)
- basr %r13,0 # base address
- .base:
- stnsm sys_msk-.base(%r13),0xfb # disable DAT
- stctl %c0,%c15,ctlregs-.base(%r13)
- stm %r0,%r15,gprregs-.base(%r13)
- la %r1,load_psw-.base(%r13)
- mvc 0(8,%r0),0(%r1)
- la %r0,.back-.base(%r13)
- st %r0,4(%r0)
- oi 4(%r0),0x80
- mvc 0x68(8,%r0),0(%r1)
- la %r0,.back_pgm-.base(%r13)
- st %r0,0x6c(%r0)
- oi 0x6c(%r0),0x80
- lhi %r0,0
- diag %r0,%r0,0x308
- .back:
- basr %r13,0
- .back_base:
- oi have_diag308-.back_base(%r13),0x01
- lctl %c0,%c15,ctlregs-.back_base(%r13)
- lm %r0,%r15,gprregs-.back_base(%r13)
- j .start_reloc
- .back_pgm:
- lm %r0,%r15,gprregs-.base(%r13)
- .start_reloc:
- lhi %r10,-1 # preparing the mask
- sll %r10,12 # shift it such that it becomes 0xf000
- .top:
- lhi %r7,4096 # load PAGE_SIZE in r7
- lhi %r9,4096 # load PAGE_SIZE in r9
- l %r5,0(%r2) # read another word for indirection page
- ahi %r2,4 # increment pointer
- tml %r5,0x1 # is it a destination page?
- je .indir_check # NO, goto "indir_check"
- lr %r6,%r5 # r6 = r5
- nr %r6,%r10 # mask it out and...
- j .top # ...next iteration
- .indir_check:
- tml %r5,0x2 # is it a indirection page?
- je .done_test # NO, goto "done_test"
- nr %r5,%r10 # YES, mask out,
- lr %r2,%r5 # move it into the right register,
- j .top # and read next...
- .done_test:
- tml %r5,0x4 # is it the done indicator?
- je .source_test # NO! Well, then it should be the source indicator...
- j .done # ok, lets finish it here...
- .source_test:
- tml %r5,0x8 # it should be a source indicator...
- je .top # NO, ignore it...
- lr %r8,%r5 # r8 = r5
- nr %r8,%r10 # masking
- 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0
- jo 0b
- j .top
- .done:
- sr %r0,%r0 # clear register r0
- la %r4,load_psw-.base(%r13) # load psw-address into the register
- o %r3,4(%r4) # or load address into psw
- st %r3,4(%r4)
- mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0
- tm have_diag308-.base(%r13),0x01
- jno .no_diag308
- diag %r0,%r0,0x308
- .no_diag308:
- sr %r1,%r1 # clear %r1
- sr %r2,%r2 # clear %r2
- sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero
- lpsw 0 # hopefully start new kernel...
-
- .align 8
- load_psw:
- .long 0x00080000,0x80000000
- sys_msk:
- .quad 0
- ctlregs:
- .rept 16
- .long 0
- .endr
- gprregs:
- .rept 16
- .long 0
- .endr
- have_diag308:
- .byte 0
- .align 8
- relocate_kernel_end:
- .align 8
- .globl relocate_kernel_len
- relocate_kernel_len:
- .quad relocate_kernel_end - relocate_kernel